Just released yesterday: Cisco Wireless Release 8.0 includes a feature called Receiver Start of Packet (RX-SOP), which you can think of as putting earmuffs on the access point. It’s not a new feature, as it has been used in stadiums and other high density deployments to great success for several years. WLC 8.0 adds GUI configuration support with a low, medium, and high setting.
RX-SOP is meant for dense deployments, where channel reuse is a concern. It’s a way to shrink cell sizes, but be careful: too much SOP and you can shrink your cells to the point where clients are no long able to connect.